right, little update. i went in to asda today and spoke to customer services, explained what had happened etc and she was cool, just said i needed to take in a bank statement that the bank send out, i cant takin a printout, has to be from the bank.

she also rang the main office to ask as i didnt have the receipt, and said its no problem, they just trace it back through my card - so thats a bonus.

she also made a note of it in some book, forgot what term she used for the book, but at least there is a record

ps, no one else could have got free fuel, as i ended the transaction by pressing the button. and even if they did, id already gone over the 70 quid limit lol.

only downside is that ive only just had my bank statement, so gotta wait a month

ill post what happens in a few weeks lol